Radio wavelength observations of the L134N molecular core

Journal Article · Sun Oct 01 04:00:00 EDT 1989 · Astrophysical Journal, Supplement Series; (USA)

DOI:https://doi.org/10.1086/191372· OSTI ID:7017767

Swade, D A ^[1]

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1. Five College Radio Astronomy Observatory, Amherst, MA (USA)

A detailed study of the L134N dense molecular core through radio astronomical observations of spectral lines at millimeter and centimeter wavelengths is presented. The prototypical dark cloud was chosen for the following reasons: it is a nearby cloud at a distance of 160 pc, and thus radio observations have high spatial resolution; it resides out of the galactic disk, providing unobscured viewing along the line of sight; and it is known to be a rich source of molecular emission. The absence af any embedded infrared sources leads to the assumption that L134N is either in a stage of evolution prior to star formation or is a cloud in which internal support will prohibit a star from forming. A spectral line survey of 24 molecular transitions at up to seven positions in the L134N core, and observations of molecular emission from C18O, CSm, H13CO+, SO, NH3, and C3H2 are reviewed. Results indicate different spatial distributions for each species which may be attributed to variations in the excitation conditions for each transition or chemical abundance variations within the cloud core. Observational techniques and results are presented. 25 refs.

• OSTI ID: 7017767
• Journal Information: Astrophysical Journal, Supplement Series; (USA), Journal Name: Astrophysical Journal, Supplement Series; (USA) Vol. 71; ISSN APJSA; ISSN 0067-0049
• Country of Publication: United States
• Language: English

Related Subjects

640105* -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
COSMIC GASES
DISTRIBUTION
ELECTROMAGNETIC RADIATION
EMISSION SPECTRA
FLUIDS
GASES
INTERSTELLAR SPACE
NEBULAE
NONLUMINOUS MATTER
RADIATIONS
RADIOWAVE RADIATION
SPACE
SPATIAL DISTRIBUTION
SPECTRA
SPECTROSCOPY
STARS